ManagedMediaSource: startstreaming event

Available in workersLimited availability

The startstreaming event of the ManagedMediaSource interface is fired when the streaming property changes from false to true. This indicates that the user agent needs more data to ensure uninterrupted playback, and the application should begin fetching and appending media segments.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("startstreaming", (event) => {});

onstartstreaming = (event) => {};

Event type

A generic Event.

Examples

Fetching data in response to startstreaming

This example creates a ManagedMediaSource, attaches it to a <video> element, and uses the startstreaming event to begin fetching and appending media data.

const videoUrl =
  "https://mdn.github.io/shared-assets/videos/flower-fragmented.mp4";
const mediaType = 'video/mp4; codecs="avc1.64001F, mp4a.40.2"';

if (ManagedMediaSource.isTypeSupported(mediaType)) {
  const video = document.createElement("video");
  const source = new ManagedMediaSource();

  video.controls = true;
  video.disableRemotePlayback = true;
  video.src = URL.createObjectURL(source);
  document.body.appendChild(video);

  source.addEventListener("sourceopen", () => {
    const sourceBuffer = source.addSourceBuffer(mediaType);

    source.addEventListener("startstreaming", async () => {
      console.log("startstreaming — fetching media data");
      const response = await fetch(videoUrl);
      const data = await response.arrayBuffer();
      sourceBuffer.appendBuffer(data);
    });
  });
}

Specifications

Browser compatibility

See also

• endstreaming event
• streaming
• ManagedMediaSource
• MediaSource